The concept of distillation with heat exchange inside and its principle of energy conservation were elaborated.

对塔内换热精馏的概念及其节能原理进行了详细的阐述。

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On this basis, this paper makes a further investigation and achieves an analytical solution according to the principle of energy distribution.

本文在此基础上作了进一步的研究，按照能量分配原则，得出了解析解。

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In this paper, a new mixed variational principle of energy in linear elasticity the state-parted variational principle of energy is presented.

本文提出了线弹性体力学的一类混合能量变分原理——分态能量变分原理。

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North Korea agreed in principle in 2005 to scrap its nuclear program, including a presumed arsenal of several nuclear weapons, in exchange for energy aid and diplomatic benefits.

VOA: standard.2009.04.14

And we can generalize to figure out, based on any principle quantum number n, how many orbitals we have of the same energy, n and what we can say is that for any shell n, there are n squared degenerate orbitals.

我们可以总结出来，在，主量子数为n的情况下，同一个能量上，有多少个轨道，我们可以说，对任何壳层，有n平方个简并轨道。

麻省理工公开课 - 化学原理课程节选

In the case of the energy merger, the underlying principle is unsurprising.

ECONOMIST: France

The third selling point: Hydrogen could, in principle, deliver energy independence to every nation because it can be derived using any number of sources-including oil, natural gas, nuclear fission, coal, hydroelectric power and wind.

FORBES: Companies, People, Ideas

But today Professor Andy Cooper and his team of chemists at the University of Liverpool in England are figuring out how it can help energy companies like BP or Shell store and transport methane gas, the principle component of natural gas.

FORBES: What Is Dry Water?